Barack Obama and Hillary Clinton face off tomorrow in Ohio and Texas, which is billed as the possible last day of their nominating campaign. Clinton may be increasing her lead in Ohio, while Obama's lead in Texas is within the margin of error. That's according to averages of the latest polls, which made predictions harder than ever. But Hillary Clinton says she's just getting started, and the Republican governor of Florida says his state might finance another Democratic primary. John Mercurio is executive editor of the Hotline, National Journal's daily online briefing on politics.